Table 2 Comparison of the sprint force-velocity profile between the different time points of the season and age categories.
Period 1 | Period 2 | Period 3 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
U10 | U12 | U14 | U16 | U18 | U10 | U12 | U14 | U16 | U18 | U10 | U12 | U14 | U16 | U18 | |
F0 (N) | 195.6 ± 19.6bcd | 241.7 ± 19.5bcd | 323.0 ± 17.1# | 344.6 ± 20.4*# | 356.6 ± 23.6*# | 192.6 ± 20.2bcd | 223.289 ± 22.258bcd | 307.2 ± 17.7#cd | 442.5 ± 21.1# | 463.7 ± 24.3 | 208.8 ± 18.1bcd | 247.1 ± 19.2bcd | 354.9 ± 15.9d | 400.1 ± 18.9 | 474.6 ± 21.8 |
F0 (N/kg−1) | 6.1 ± 0.2 | 6.4 ± 0.2c | 6.8 ± 0.2 cd | 5.3 ± 0.2*# | 5.4 ± 0.2*# | 5.8 ± 0.2 | 5.7 ± 0.2 | 6.3 ± 0.1# | 6.6 ± 0.2 | 6.7 ± 0.2 | 6.3 ± 0.2 | 6.3 ± 0.2 | 7.0 ± 0.2 | 6.1 ± 0.2 | 6.8 ± 0.3 |
VO (m/s−1) | 6.1 ± 0.1bcd | 6.4 ± 0.1#bcd | 7.3 ± 0.1 cd | 9.0 ± 0.1* | 9.2 ± 0.2* | 6.3 ± 0.1bcd | 6.3 ± 0.1#bcd | 7.3 ± 0.1 cd | 8.3 ± 0.1# | 8.6 ± 0.2 | 6.3 ± 0.1bcd | 6.8 ± 0.1bcd | 7.6 ± 0.1 cd | 8.7 ± 0.1 | 8.8 ± 01 |
P max (W) | 300.2 ± 36.4bcd | 389.5 ± 38.9bcd | 594.8 ± 31.9#cd | 762.3 ± 37.9*# | 817.6 ± 43.8*# | 302.3 ± 43.4bcd | 353.8 ± 41.2#bcd | 568.1 ± 38.0#cd | 920.1 ± 45.2 | 1003.3 ± 52.2 | 334.4 ± 39.2bcd | 424.524 ± 37.284bcd | 678.234 ± 34.337 cd | 868.823 ± 40.870 | 1051.450 ± 47.192 |
P max (W·kg−1) | 9.5 ± 0.4bcd | 10.3 ± 0.4*b | 12.6 ± 0.4 | 11.9 ± 0.4*# | 12.4 ± 0.5*# | 9.1 ± 0.4bcd | 9.2 ± 0.4#bcd | 11.6 ± 0.4#cd | 13.7 ± 0.5 | 14.5 ± 0.5 | 10.1 ± 0.5bcd | 10.890 ± 0.503bcd | 13.459 ± 0.489 | 13.277 ± 0.582 | 15.249 ± 0.672 |
FV-slope kg−1 | − 1.01 ± 0.03 cd | -0.99 ± 0.03 cd | -0.93 ± 0.03 cd | -0.61 ± 0.03* | − 0.59 ± 0.04*# | − 0.92 ± 0.03 | − 0.91 ± 0.02 | -0.86 ± 0.02 | − 0.80 ± 0.03# | − 0.78 ± 0.04 | -0.99 ± 0.03 cd | − 0.92 ± 0.04c | − 0.92 ± 0.03c | − 0.70 ± 0.04 | − 0.77 ± 0.04 |
RFpeak (%) | 16.4 ± 0.4bcd | 16.7 ± 0.5#bcd | 19.1 ± 0.4 cd | 23.1 ± 0.4 | 24.0 ± 0.5 | 16.6 ± 0.5bcd | 16.9 ± 0.5#bcd | 1.95 ± 0.4 cd | 22.1 ± 0.5# | 23.0 ± 0.6 | 16.4 ± 0.5bcd | 18.2 ± 0.4 cd | 19.8 ± 0.4 cd | 23.3 ± 0.5 | 23.8 ± 0.5 |
DRF (%) | 10.0 ± 0.4 cd | 9.8 ± 0.3 cd | 9.2 ± 0.3 cd | 5.9 ± 0.4* | 5.7 ± 0.4*# | 9.2 ± 0.3d | 9.0 ± 0.4 | 8.5 ± 0.3 | 7.8 ± 0.4# | 7.6 ± 0.4 | 9.9 ± 0.3 cd | 9.1 ± 0.3 cd | 9.1 ± 0.3 cd | 6.7 ± 0.004c | 7.5 ± 0.4 |